CVE-2026-106119

UNKNOWN 0.0

LangChain: MongoDBChatMessageHistory query injection can allow cross-session access

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

LangChain is a framework for building LLM-powered applications. Prior to 1.3.1, MongoDBChatMessageHistory does not enforce the documented string type for an untrusted structured session identifier at runtime, allowing the identifier to be interpreted as a MongoDB query condition rather than as a literal value when multiple users' histories are stored in a shared MongoDB collection. An attacker able to invoke chat-history operations can read, modify, or delete another user's stored conversation. Applications using authenticated, server-controlled string identifiers are not affected. This issue is fixed in version 1.3.1.

CWE	CWE-943
Vendor	langchain-ai
Product	langchainjs
Published	Oct 6, 2026

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Affected Versions

langchain-ai / langchainjs

< 1.5.14

@langchain / mongodb

< 1.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-m6rx-h84q-8r95 github.com: https://github.com/langchain-ai/langchainjs/pull/11672 github.com: https://github.com/langchain-ai/langchainjs/commit/946e3d856ff1f8ce7f7b9374c83f680a6ada79af github.com: https://github.com/langchain-ai/langchainjs/releases/tag/@langchain/[email protected]